STMICROELECTRONICS ACST28S

ACST2 Series
AC Switch family
Alternating current switch
Main features
Symbol
OUT
Value
Unit
G
COM
IT(RMS)
2
A
VDRM/VRRM
800
V
IGT
10
mA
■
Overvoltage crowbar technology
■
High noise immunity: static dV/dt > 500 V/µs
The ACST2-8SFP in the TO-220FPAB package
provides insulation voltage rated at 1500VRMS
Main application
■
AC ON/OFF static switching in appliances &
industrial control systems
■
Drive of low power highly resistive or inductive
loads like:
– solenoid,
– pump, fan, micro-motor
G
OUT
COM
TO-220FPAB
ACST2-8SFP
DPAK
ACST2-8SB
Benefits
■
Enables equipment to meet IEC 61000-4-5
■
High off-state reliability with planar technology
■
Needs no external overvoltage protection
■
Reduces component count
■
Interfaces directly with the micro-controller
■
High immunity against fast transients
described in IEC 61000-4-4 standards
Order code
Description
Part number
Marking
The ACST2 series belongs to the AC power
switch family built around the ASD technology.
This high performance device is adapted to home
appliances or industrial systems and drives loads
up to 2 A.
ACST2-8SFP
ACST28S
ACST2-8SB
ACST28S
Functional diagram
This ACST2 switch embeds a Triac structure with
a high voltage clamping device to absorb the
inductive turn-off energy and withstand line
transients such as those described in the
IEC 61000-4-5 standards. The component needs
a low gate current to be activated (IGT < 10 mA)
and in the mean time provides a high electrical
noise immunity such as those described in the
IEC 61000-4-4 standards.
March 2007
OUT
G
COM
Rev 1
1/11
www.st.com
11
Characteristics
ACST2 Series
1
Characteristics
Table 1.
Absolute maximum ratings (limiting values)
Symbol
Parameter
Value
TO-220FPAB
IT(RMS)
ITSM
²
It
dI/dt
RMS on-state current (full sine wave)
Non repetitive surge peak on-state current
(full cycle sine wave, TJ initial = 25° C)
²
Tc = 105° C
A
2
DPAK
Tc = 110 °C
F = 60 Hz
t = 16.7 ms
8.4
F = 50 Hz
t = 20 ms
8.0
I t Value for fusing
tp = 10 ms
Critical rate of rise of on-state current
IG = 2 x IGT, tr = 100 ns
F = 120 Hz
Unit
A
0.5
A ²s
Tj = 125° C
50
A/µs
VPP (1)
Non repetitive line peak mains voltage (1)
Tj = 25° C
2
kV
PG(AV)
Average gate power dissipation
Tj = 125° C
0.1
W
PGM
Peak gate power dissipation (tp = 20 µs)
Tj = 125° C
10
W
IGM
Peak gate current (tp = 20 µs)
Tj = 125° C
1.6
A
Tstg
Tj
Storage junction temperature range
Operating junction temperature range
-40 to +150
-40 to +125
°C
260
°C
Tl
Maximum lead soldering temperature during 10 s (at 3 mm from plastic case)
1. according to test described by IEC 61000-4-5 standard and Figure 16
Table 2.
Electrical characteristics (Tj = 25° C, unless otherwise specified)
Symbol
Test conditions
Value
Unit
IGT(1)
VOUT = 12 V RL = 33 Ω
I - II - III
MAX
10
mA
VGT
VOUT = 12 V RL = 33 Ω
I - II - III
MAX
1.1
V
VGD
VOUT = VDRM RL = 3.3 kΩ Tj = 125° C
I - II - III
MIN
0.2
V
IH (2)
IOUT = 100 mA
MAX
10
mA
I - III
MAX
25
II
MAX
35
VOUT = 67% VDRM gate open Tj = 125° C
MIN
500
V/µs
(dV/dt)c = 15 V/µs Tj = 125° C
MIN
0.5
A/ms
ICL = 0.1 mA tp = 1 ms Tj = 25° C
MIN
850
V
IL
dV/dt (2)
(dI/dt)c (2)
VCL
IG = 1.2 x IGT
1. minimum IGT is guaranteed at 5% of IGT max
2. for both polarity of OUT pin referenced to COM pin
2/11
Quadrant
mA
ACST2 Series
Table 3.
Characteristics
Static electrical characteristics
Symbol
VTM(1)
(1)
Test conditions
Value
Unit
ITM = 2.8 A tp = 500 µs
Tj = 25° C
MAX
2
V
Threshold voltage
Tj = 125° C
MAX
0.9
V
RD(1)
Dynamic resistance
Tj = 125° C
MAX
250
mΩ
IDRM
IRRM
10
µA
VOUT = VDRM / VRRM
0.5
mA
VTO
Tj = 25° C
MAX
Tj = 125° C
1. for both polarity of OUT pin referenced to COM pin
Table 4.
Thermal resistances
Symbol
Parameter
Value
DPAK
Rth(j-c)
Unit
4.5
Junction to case (AC)
TO-220FPAB
7
TO-220FPAB
60
DPAK
70
° C/W
Rth(j-a)
Junction to ambient
SCU (1)= 0.5 cm²
1. SCU = copper surface under tab
Figure 1.
Maximum power dissipation versus Figure 2.
RMS on-state current (full cycle)
P(W)
RMS on-state current versus case
temperature
IT(RMS)(A)
2.8
2.4
α=180 °
2.2
2.4
DPAK
2.0
1.8
2.0
TO-220FPAB
1.6
1.4
1.6
1.2
1.2
1.0
0.8
0.8
0.6
180°
0.4
0.4
0.2
0.4
0.6
0.8
1.0
TC(°C)
0.0
0.0
0.0
α=180 °
0.2
IT(RMS)(A)
1.2
1.4
1.6
1.8
2.0
0
25
50
75
100
125
3/11
Characteristics
Figure 3.
ACST2 Series
RMS on-state current versus
ambient temperature
Figure 4.
IT(RMS) (A)
1.00
1.8
Relative variation of thermal
impedance versus pulse duration TO-220FPAB
K=[Zth/Rth]
α=180 °
Printed circuit board FR4
Natural convection
SCU=0.5 cm²
1.6
1.4
Zth(j-c)
1.2
Zth(j-a)
1.0
0.10
0.8
0.6
0.4
0.2
Tamb(°C)
0.0
0
25
Figure 5.
1.0E+00
50
75
100
125
1.0E-04
1.0E-02
1.0E-01
1.0E+00 1.0E+01 1.0E+02 1.0E+03
Relative variation of gate trigger
current IGT, holding current IH and
latching current IL versus junction
temperature (typical values)
IGT, IH, IL [T J] / IGT, IH, IL [T j=25 °C]
2.8
2.6
2.4
2.2
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
Zth(j-c)
Zth(j-a)
1.0E-01
DPAK
tP(s)
1.0E-02
Relative variation of static dV/dt
versus junction temperature
2.0
VOUT=540 V
IL & IH
Tj(°C)
Figure 8.
dV/dt [T j] / dV/dt [T j=125 °C]
100
IGT
-40 -30 -20 -10
1.0E-04 1.0E-03 1.0E-02 1.0E-01 1.0E+00 1.0E+01 1.0E+02 1.0E+03
Figure 7.
1.0E-03
Relative variation of thermal
Figure 6.
impedance versus pulse duration DPAK
K=[Zth/Rth]
TO-220FPAB
tP(s)
0.01
0
10 20 30 40 50 60 70 80 90 100 110 120 130
Relative variation of critical rate of
decrease of main current versus
reapplied dV/dt (typical values)
(dI/dt)c [ (dV/dt) c ] / Specified (dI/dt) c
VOUT=300 V
1.8
1.6
1.4
1.2
1.0
10
0.8
0.6
0.4
0.2
T j(°C)
25
4/11
(dV/dt)c(V/µs)
0.0
1
50
75
100
125
0.1
1.0
10.0
100.0
ACST2 Series
Figure 9.
Characteristics
Relative variation of critical rate of
decrease of main current versus
junction temperature
(dI/dt)c [T j] / (dI/dt)c [T j=125 °C]
Figure 10. Surge peak on-state current versus
number of cycles
9
20
VOUT=300 V
18
ITSM (A)
8
16
t=20ms
7
14
One cycle
Non repetitive
Tj initial=25 °C
6
12
5
10
4
8
Repetitive
TC=110 °C
3
6
2
4
1
2
T j(°C)
Number of cycles
0
0
25
50
75
100
125
1
10
100
1000
Figure 11. Non repetitive surge peak on-state Figure 12. On-state characteristics (maximum
values)
current for a sinusoidal pulse with
width tP < 10 ms, and
corresponding value of I²t
ITSM(A), I²t (A²s)
100.0
ITM(A)
1.E+01
Tj initial=25 °C
ITSM
10.0
Tj=125 °C
1.E+00
1.0
1.E-01
I²t
0.10
TJ max. :
VTO= 0.90 V
RD= 250 mW
VTM(V)
tP(ms)
0.1
0.01
Tj=25 °C
1.E-02
1.00
10.00
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
Figure 14. Relative variation of clamping
voltage VCL versus junction
temperature
Figure 13. Thermal resistance junction to
ambient versus copper surface
under tab (printed circuit board
FR4, eCU = 35 µm) (DPAK)
Rth(j-a) (°C/W)
VCL [T j] / VCL [T j=25 °C]
1.20
100
DPAK
90
1.15
80
1.10
70
60
1.05
50
1.00
40
30
0.95
20
0.90
10
T j(°C)
SCU(cm²)
0
0
5
10
15
20
0.85
25
30
35
40
-40
-20
0
20
40
60
80
100
120
140
5/11
AC line switch basic application
2
ACST2 Series
AC line switch basic application
The ACST2 device has been designed to switch on and off highly inductive or resistive loads
such as pump, valve, fan, or bulb lamp. Thanks to its high sensitivity (IGT max = 10 mA), the
ACST2 can be driven directly by logic level circuits through a resistor as shown on the
typical application diagram. Thanks to its thermal and turn-off commutation performances,
the ACST2 switch can drive, without any additional snubber, an inductive load up to 2 A.
Figure 15. Typical application diagram
Line
L
AC Mains
AC LOAD
R
ACST2
Rg
Power supply
2.1
MCU
Protection against overvoltage: the best choice is ACST
In comparison with standard triacs, which are not robust against surge voltages, the ACST2
is over-voltage self-protected, specified by the new parameter VCL. In addition, ACST2 is a
sensitive device (IGT = 10mA), but provides a high noise immunity level against fast
transients.
The ACST2 switch is able to sustain safely the AC line transient voltages either by clamping
the low energy spikes or by breaking over under high energy shocks, even with fast turn-on
current rises.
The test circuit of the Figure 16 is representative of the final ACST2 application, and is also
used to stress the ACST switch according to the IEC 61000-4-5 standard conditions. Thanks
to the load limiting the current, the ACST switch sustains the voltage spikes up to 2 kV
above the peak line voltage. The protection is based on an overvoltage crowbar technology.
Actually, the ACST2 will break over safely as shown on Figure 17. The ACST is recovering
its blocking voltage capability at the next zero current crossing point. Such non repetitive test
can be done 10 times on each AC line voltage polarity.
6/11
ACST2 Series
Ordering information scheme
Figure 16. Overvoltage ruggedness test circuit Figure 17. Typical current and voltage
for resistive and inductive loads
waveforms across the ACST2
according to IEC 61000-4-5
during IEC 61000-4-5 standard test
standards:
R = 200 Ω, L = 10 µH, Vpp = 2 kV
Surge generator
2kV surge
Filtering unit
VOUT (200 V/div)
Rgene
Model of the load
L
R
IOUT (500 mA/div)
AC Mains
ACST2-8x
Rg
2.2
Electrical noise immunity
Even if the ACST2 is a sensitive device (IGT = 10 mA) and can be controlled directly though
a simple resistor by a logic level circuit, it provides a high electrical noise immunity. The
intrinsic immunity of the ACST2 is shown by the specified dV/dt equal to 500 V/µs @ 125° C.
This immunity level is 5 to 10 times higher than the immunity provided by an equivalent
standard technology triac with the same sensitivity. In other word, ACST2 is sensitive, but
has an immunity reaching the one provided by non-sensitive device (IGT higher than 35 mA).
3
Ordering information scheme
ACST 2 - 8
S
FP -TR
AC Switch series
Current
2 = 2 ARMS
Voltage
8 = 800 V
Sensitivity
S = 10 mA
Package
FP = TO-220FPAB
B = DPAK
Packing
TR = Tape and reel (DPAK)
Blank = Tube (TO-220FPAB, DPAK)
7/11
Package information
4
ACST2 Series
Package information
●
Epoxy meets UL94, V0
Table 5.
TO-220FPAB dimensions
Dimensions
Ref.
A
B
H
Dia
L6
L7
L2
L3
L5
F1
L4
F
G
8/11
Inches
Min.
Max.
Min.
Max.
A
4.4
4.6
0.173
0.181
B
2.5
2.7
0.098
0.106
D
2.5
2.75
0.098
0.108
E
0.45
0.70
0.018
0.027
F
0.75
1
0.030
0.039
F1
1.15
1.70
0.045
0.067
F2
1.15
1.70
0.045
0.067
G
4.95
5.20
0.195
0.205
G1
2.4
2.7
0.094
0.106
H
10
10.4
0.393
0.409
D
F2
G1
Millimeters
L2
E
16 Typ.
0.63 Typ.
L3
28.6
30.6
1.126
1.205
L4
9.8
10.6
0.386
0.417
L5
2.9
3.6
0.114
0.142
L6
15.9
16.4
0.626
0.646
L7
9.00
9.30
0.354
0.366
Dia.
3.00
3.20
0.118
0.126
ACST2 Series
Package information
Table 6.
DPAK dimensions
Dimensions
Ref.
E
A
B2
C2
L2
Millimeters
Inches
Min.
Max.
Min.
Max.
A
2.20
2.40
0.086
0.094
A1
0.90
1.10
0.035
0.043
A2
0.03
0.23
0.001
0.009
B
0.64
0.90
0.025
0.035
B2
5.20
5.40
0.204
0.212
C
0.45
0.60
0.017
0.023
C2
0.48
0.60
0.018
0.023
D
6.00
6.20
0.236
0.244
E
6.40
6.60
0.251
0.259
G
4.40
4.60
0.173
0.181
H
9.35
10.10
0.368
0.397
D
R
H
L4
A1
B
G
R
C
A2
0.60 MIN.
V2
L2
0.80 typ.
0.031 typ.
L4
0.60
1.00
0.023
0.039
V2
0°
8°
0°
8°
Figure 18. Footprint (dimensions in mm)
6.7
3
3
1.6
2.3
6.7
2.3
1.6
In order to meet environmental requirements, ST offers these devices in ECOPACK®
packages. These packages have a lead-free second level interconnect. The category of
second level interconnect is marked on the package and on the inner box label, in
compliance with JEDEC Standard JESD97. The maximum ratings related to soldering
conditions are also marked on the inner box label. ECOPACK is an ST trademark.
ECOPACK specifications are available at: www.st.com.
9/11
Ordering information
5
6
10/11
ACST2 Series
Ordering information
Part number
Marking
Package
Weight
Base Qty
Packing mode
ACST2-8SFP
ACST28S
TO-220FPAB
2.4g
50
Tube
ACST2-8SB
ACST28S
DPAK
0.3g
50
Tube
ACST2-8SB-TR
ACST28S
DPAK
0.3g
2500
Tape and Reel
Revision history
Date
Revision
01-Mar-2007
1
Changes
Initial release.
ACST2 Series
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11/11